leetcode1347. Minimum Number of Steps to Make Two Strings Anagram

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题目如下:

Given two equal-size strings s and t. In one step you can choose any character of t and replace it with another character.

Return the minimum number of steps to make t an anagram of s.

An Anagram of a string is a string that contains the same characters with a different (or the same) ordering.

Example 1:

Input: s = "bab", t = "aba"
Output: 1
Explanation: Replace the first ‘a‘ in t with b, t = "bba" which is anagram of s.

Example 2:

Input: s = "leetcode", t = "practice"
Output: 5
Explanation: Replace ‘p‘, ‘r‘, ‘a‘, ‘i‘ and ‘c‘ from t with proper characters to make t anagram of s.

Example 3:

Input: s = "anagram", t = "mangaar"
Output: 0
Explanation: "anagram" and "mangaar" are anagrams. 

Example 4:

Input: s = "xxyyzz", t = "xxyyzz"
Output: 0

Example 5:

Input: s = "friend", t = "family"
Output: 4

Constraints:

  • 1 <= s.length <= 50000
  • s.length == t.length
  • s and t contain lower-case English letters only.

解题思路:只要求出s和t之间差异的字符的数量即可。

代码如下:

class Solution(object):
    def minSteps(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: int
        """
        val = [0] * 26;
        res = 0;
        for i in s:
            val[ord(i) - ord(a)] += 1
        
        for i in t:
            val[ord(i) - ord(a)] -= 1  
   
        for i in val:
            if i > 0:
                res += i
        return res
        

 

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